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The percentage of profit, when an article is sold for $ 78, is twice than when it is sold for $ 69. The cost price of the article is :
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- $ 49
- $ 51
- $ 57
- $ 60
Correct Option: D
Let the C.P. of article be y.
Then, According to question,
 | 78 - y |  | × 100 | = | 2 × | | 69 - y | | × 100 | ||
| y | y |
⇒ 78 – y = 2 × 69 – 2y
⇒ 2y – y = 138 – 78
⇒ y = $ 60
